Quick closing valve with fluid pressure release mechanism



Feb. 16, 1954 1 RAMSAY 2,669,257

QUICK CLOSING VALVE WITH FLUID PRESSURE RELEASE MECHANISM Filed July 28, 1951 2 Sheets-Sheet 1 Feb. 16, 1954 v A. RAMSAY 1 2,669,257

' QUICK CLOSING VALVE WITH FLUID PRESSURE RELEASE MECHANISM Filed July 28, 1 951 2 Sheets-Sheet 2 Patented Feb. 16, 1954 QUICK CLOSING VALVE WITH FLUID PRESSURE RELEASE MECHANISM Alexander Ramsay, Glasgow, Scotland, assignor to James Howden & Company Limited, Glasgow, Scotland, a corporation of Great Britain and Northern Ireland Application July 28, 1951, Serial No. 239,034

1 Claim.

This invention relates to quick closing valves of the type in which a screw-threaded spindle is in engagement with a nut forming element entrained by the movable member of the valve, and is slidable axially as well as being rotatable, a spring being provided to urge the spindle to slide towards valve-closed position, and in which one end of a toggle is pivoted to a collar entrained by the spindle, the other end of the toggle being pivoted to a fixed pivot, and one end of a trip member is pivoted to the centre of the toggle, the other end being engageable with a fixed seat.

In a valve of the type referred to according to the invention a lever is pivoted at one end to a fixed support and is connected at the other end to operating means, said lever carrying two abutments, one engageable with the trip member, and the other engageable with one of the links of the toggle.

A practical embodiment of the invention is illustrated in the accompanying drawings in which Fig. 1 is a side elevation of a valve and Fig. 2 is a cross section on the line 2-2 in Fig. 1.

In the drawings, I denotes a valve body containing a movable member 2 entraining a nutforming element 3 engaging a screw-threaded spindle 4 slidable axially through a gland 5, said spindle 4 carrying a handle 6 and being urged by a spring 1 to slide into the valve body I. 8 and 9 denote links of a toggle connected to one another at [0, the links 8 being pivoted at II to a collar l2 entrained by the spindle 4, and the links 9 being pivoted at l3 to the valve body I. I4 denotes a trip member pivoted at one end to the centre pivot ll] of the toggle, the other end being engageable with a fixed seat [5. l6 denotes a lever adapted to swing around the pivot l3 and pivoted at ll to a piston rod IB connected to a piston is slidable in a cylinder 20, said cylinder being adapted to receive operating fiuid at the bottom through a connection 23. The lever I6 at one side carries an abutment 2| engageable with the trip member I4, and on the other side carries a second abutment 22 engageable with one of the links 9 of the toggle.

In practice, when the valve is being used normally, the spindle -4 is slid away from the valve body I, the toggle links 8 and 9 being disposed almost in alignment, the trip member l4 being engaged with the fixed seat I5 and the piston [9 being in the inoperative position. When the valve is thus arranged, the movable member 2, i. e., the sluice in the valve illustrated, may be moved between the valve-closed and the valve-open positions by rotating the spindle 4. When the valve is open and is to be closed rapidly, the piston [9 is actuated, swinging the lever 18 about its pivot l3 and causing the abutment 2| to come into contact with the trip member M and disengage the trip member M from its seat [5. The toggle thereupon is broken, assisted by the abutment 22, and the spring 1 slides the spindle 4 into the valve body I to close the valve.

What is claimed is:

In a quick closing valve, in combination, a valve housing presenting a valve opening, a movable valve closure member to close said opening, an axially movable and rotatable screw-threaded spindle entering said housing, a nut-forming element within said housing, said nut-forming element engaging said spindle and being entrained by said movable member, a spring urging said spindle to slide within said housing towards valve-closed position, a toggle comprising jointed links disposed externally of said housing, one link of said toggle being pivoted to said housing, a collar entrained by said spindle and pivoted to the other link of said toggle, a trip member pivoted at one end to the joint of said toggle links, a fixed seat presented by said housing and engageable by the other end of said trip member, a double lever presenting two abutments, one end of said lever being pivoted to the pivot of the first-mentioned toggle link and a fluid pressure release mechanism coupled to the other end of said lever, one of said abutments being engageable with said trip member, and the other abutment being engageable with one of the links of said toggle.

ALEXANDER RAMSAY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 930,847 Dolley Aug. 10, 1909 960,872 Fischer June 7, 1910 1,324,409 Richardson Dec. 9, 1919 1,594,177 Knauf July 27, 1926 2,504,638 Browning Apr. 18, 1950 

